Samsung started to roll out Android 4.1.2 Jelly Bean for Galaxy S2 I9100, aka SGS2. this update includes new features like Touchwiz UX (the UI from Galaxy S3 I9300), new notification bar with customizable toggles, two home screen mode (basic mode and easy mode) etc, plus enhanced performance


image source: gsmarena.com


I9100XWLS8 firmware details:
pda: XWLS8
csc: FOPLS3
date: 16 Jan 2013


I9100ZCLSF firmware details:
pda: ZCLSF
csc: OZHLSF (Chinese - China, Hong Kong, Taiwan)
date: 11 Jan 2013


download links:
I9100XWLS8 (by sammobile)
I9100ZCLSF (by sammobile)